Problems compiling devel/gmp on Solaris

Hello,
I would just like to report my problem building ${SUBJ} on SunOS 5.11.
Complete log is attached. This helped:
$ diff Makefile.orig Makefile
45c45
< . if ${OPSYS} == "Darwin" || !empty(PKGSRC_COMPILER:Msunpro)
---
> . if ${OPSYS} == "Darwin" || ${OPSYS} == "SunOS" ||
> !empty(PKGSRC_COMPILER:Msunpro)
Is this a way how to push the change into upstream or should I write to
author also?
Regards
--
Martin Rehak